[pulseview.git] / pv / view / view.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifdef ENABLE_DECODE
#include <libsigrokdecode/libsigrokdecode.h>
#endif

#include <cassert>
#include <climits>
#include <cmath>
#include <mutex>

#include <QEvent>
#include <QMouseEvent>
#include <QScrollBar>

#include "cursorheader.h"
#include "decodetrace.h"
#include "header.h"
#include "ruler.h"
#include "signal.h"
#include "view.h"
#include "viewport.h"

#include "pv/sigsession.h"
#include "pv/data/logic.h"
#include "pv/data/logicsnapshot.h"

using boost::shared_lock;
using boost::shared_mutex;
using pv::data::SignalData;
using std::back_inserter;
using std::deque;
using std::list;
using std::lock_guard;
using std::max;
using std::make_pair;
using std::min;
using std::pair;
using std::set;
using std::shared_ptr;
using std::vector;
using std::weak_ptr;

namespace pv {
namespace view {

const double View::MaxScale = 1e9;
const double View::MinScale = 1e-15;

const int View::MaxScrollValue = INT_MAX / 2;

const int View::SignalHeight = 30;
const int View::SignalMargin = 10;
const int View::SignalSnapGridSize = 10;

const QColor View::CursorAreaColour(220, 231, 243);

const QSizeF View::LabelPadding(4, 0);

View::View(SigSession &session, QWidget *parent) :
	QAbstractScrollArea(parent),
	_session(session),
	_viewport(new Viewport(*this)),
	_ruler(new Ruler(*this)),
	_cursorheader(new CursorHeader(*this)),
	_header(new Header(*this)),
	_scale(1e-6),
	_offset(0),
	_v_offset(0),
	_updating_scroll(false),
	_show_cursors(false),
	_cursors(*this),
	_hover_point(-1, -1)
{
	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
		this, SLOT(h_scroll_value_changed(int)));
	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
		this, SLOT(v_scroll_value_changed(int)));

	connect(&_session, SIGNAL(signals_changed()),
		this, SLOT(signals_changed()));
	connect(&_session, SIGNAL(capture_state_changed(int)),
		this, SLOT(data_updated()));
	connect(&_session, SIGNAL(data_received()),
		this, SLOT(data_updated()));
	connect(&_session, SIGNAL(frame_ended()),
		this, SLOT(data_updated()));

	connect(_cursors.first().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));
	connect(_cursors.second().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));

	connect(_header, SIGNAL(geometry_updated()),
		this, SLOT(on_geometry_updated()));
	connect(_header, SIGNAL(signals_moved()),
		this, SLOT(on_signals_moved()));

	connect(_header, SIGNAL(selection_changed()),
		_cursorheader, SLOT(clear_selection()));
	connect(_cursorheader, SIGNAL(selection_changed()),
		_header, SLOT(clear_selection()));

	connect(_header, SIGNAL(selection_changed()),
		this, SIGNAL(selection_changed()));
	connect(_cursorheader, SIGNAL(selection_changed()),
		this, SIGNAL(selection_changed()));

	connect(this, SIGNAL(hover_point_changed()),
		this, SLOT(on_hover_point_changed()));

	setViewport(_viewport);

	_viewport->installEventFilter(this);
	_ruler->installEventFilter(this);
	_cursorheader->installEventFilter(this);
	_header->installEventFilter(this);

	// Trigger the initial event manually. The default device has signals
	// which were created before this object came into being
	signals_changed();

	// make sure the transparent widgets are on the top
	_cursorheader->raise();
	_header->raise();
}

SigSession& View::session()
{
	return _session;
}

const SigSession& View::session() const
{
	return _session;
}

View* View::view()
{
	return this;
}

const View* View::view() const
{
	return this;
}

Viewport* View::viewport()
{
	return _viewport;
}

const Viewport* View::viewport() const
{
	return _viewport;
}

double View::scale() const
{
	return _scale;
}

double View::offset() const
{
	return _offset;
}

int View::owner_v_offset() const
{
	return -_v_offset;
}

void View::zoom(double steps)
{
	zoom(steps, _viewport->width() / 2);
}

void View::zoom(double steps, int offset)
{
	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
}

void View::zoom_fit()
{
	const pair<double, double> extents = get_time_extents();
	const double delta = extents.second - extents.first;
	if (delta < 1e-12)
		return;

	assert(_viewport);
	const int w = _viewport->width();
	if (w <= 0)
		return;

	const double scale = max(min(delta / w, MaxScale), MinScale);
	set_scale_offset(scale, extents.first);
}

void View::zoom_one_to_one()
{
	using pv::data::SignalData;

	// Make a set of all the visible data objects
	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	if (visible_data.empty())
		return;

	double samplerate = 0.0;
	for (const shared_ptr<SignalData> d : visible_data) {
		assert(d);
		samplerate = max(samplerate, d->samplerate());
	}

	if (samplerate == 0.0)
		return;

	assert(_viewport);
	const int w = _viewport->width();
	if (w <= 0)
		return;

	set_zoom(1.0 / samplerate, w / 2);
}

void View::set_scale_offset(double scale, double offset)
{
	_scale = scale;
	_offset = offset;

	update_scroll();
	_ruler->update();
	_cursorheader->update();
	_viewport->update();
	scale_offset_changed();
}

set< shared_ptr<SignalData> > View::get_visible_data() const
{
	shared_lock<shared_mutex> lock(session().signals_mutex());
	const vector< shared_ptr<Signal> > &sigs(session().signals());

	// Make a set of all the visible data objects
	set< shared_ptr<SignalData> > visible_data;
	for (const shared_ptr<Signal> sig : sigs)
		if (sig->enabled())
			visible_data.insert(sig->data());

	return visible_data;
}

pair<double, double> View::get_time_extents() const
{
	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	if (visible_data.empty())
		return make_pair(0.0, 0.0);

	double left_time = DBL_MAX, right_time = DBL_MIN;
	for (const shared_ptr<SignalData> d : visible_data)
	{
		const double start_time = d->get_start_time();
		double samplerate = d->samplerate();
		samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;

		left_time = min(left_time, start_time);
		right_time = max(right_time, start_time +
			d->get_max_sample_count() / samplerate);
	}

	assert(left_time < right_time);
	return make_pair(left_time, right_time);
}

bool View::cursors_shown() const
{
	return _show_cursors;
}

void View::show_cursors(bool show)
{
	_show_cursors = show;
	_cursorheader->update();
	_viewport->update();
}

void View::centre_cursors()
{
	const double time_width = _scale * _viewport->width();
	_cursors.first()->set_time(_offset + time_width * 0.4);
	_cursors.second()->set_time(_offset + time_width * 0.6);
	_cursorheader->update();
	_viewport->update();
}

CursorPair& View::cursors()
{
	return _cursors;
}

const CursorPair& View::cursors() const
{
	return _cursors;
}

const QPoint& View::hover_point() const
{
	return _hover_point;
}

void View::normalize_layout()
{
	int v_min = INT_MAX;
	for (const shared_ptr<RowItem> r : *this)
		v_min = min(r->v_offset(), v_min);

	const int delta = -min(v_min, 0);
	for (shared_ptr<RowItem> r : *this)
		r->set_v_offset(r->v_offset() + delta);

	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
}

void View::update_viewport()
{
	assert(_viewport);
	_viewport->update();
}

void View::get_scroll_layout(double &length, double &offset) const
{
	const pair<double, double> extents = get_time_extents();
	length = (extents.second - extents.first) / _scale;
	offset = _offset / _scale;
}

void View::set_zoom(double scale, int offset)
{
	const double cursor_offset = _offset + _scale * offset;
	const double new_scale = max(min(scale, MaxScale), MinScale);
	const double new_offset = cursor_offset - new_scale * offset;
	set_scale_offset(new_scale, new_offset);
}

void View::update_scroll()
{
	assert(_viewport);

	const QSize areaSize = _viewport->size();

	// Set the horizontal scroll bar
	double length = 0, offset = 0;
	get_scroll_layout(length, offset);
	length = max(length - areaSize.width(), 0.0);

	horizontalScrollBar()->setPageStep(areaSize.width() / 2);

	_updating_scroll = true;

	if (length < MaxScrollValue) {
		horizontalScrollBar()->setRange(0, length);
		horizontalScrollBar()->setSliderPosition(offset);
	} else {
		horizontalScrollBar()->setRange(0, MaxScrollValue);
		horizontalScrollBar()->setSliderPosition(
			_offset * MaxScrollValue / (_scale * length));
	}

	_updating_scroll = false;

	// Set the vertical scrollbar
	verticalScrollBar()->setPageStep(areaSize.height());
	verticalScrollBar()->setRange(0,
		_viewport->get_total_height() + SignalMargin -
		areaSize.height());
}

void View::update_layout()
{
	setViewportMargins(
		_header->sizeHint().width() - pv::view::Header::BaselineOffset,
		_ruler->sizeHint().height(), 0, 0);
	_ruler->setGeometry(_viewport->x(), 0,
		_viewport->width(), _viewport->y());
	_cursorheader->setGeometry(
		_viewport->x(),
		_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
		_viewport->width(), _cursorheader->sizeHint().height());
	_header->setGeometry(0, _viewport->y(),
		_header->sizeHint().width(), _viewport->height());
	update_scroll();
}

void View::paint_label(QPainter &p, int right, bool hover)
{
	(void)p;
	(void)right;
	(void)hover;
}

QRectF View::label_rect(int right)
{
	(void)right;
	return QRectF();
}

bool View::eventFilter(QObject *object, QEvent *event)
{
	const QEvent::Type type = event->type();
	if (type == QEvent::MouseMove) {

		const QMouseEvent *const mouse_event = (QMouseEvent*)event;
		if (object == _viewport)
			_hover_point = mouse_event->pos();
		else if (object == _ruler || object == _cursorheader)
			_hover_point = QPoint(mouse_event->x(), 0);
		else if (object == _header)
			_hover_point = QPoint(0, mouse_event->y());
		else
			_hover_point = QPoint(-1, -1);

		hover_point_changed();

	} else if (type == QEvent::Leave) {
		_hover_point = QPoint(-1, -1);
		hover_point_changed();
	}

	return QObject::eventFilter(object, event);
}

bool View::viewportEvent(QEvent *e)
{
	switch(e->type()) {
	case QEvent::Paint:
	case QEvent::MouseButtonPress:
	case QEvent::MouseButtonRelease:
	case QEvent::MouseButtonDblClick:
	case QEvent::MouseMove:
	case QEvent::Wheel:
	case QEvent::TouchBegin:
	case QEvent::TouchUpdate:
	case QEvent::TouchEnd:
		return false;

	default:
		return QAbstractScrollArea::viewportEvent(e);
	}
}

void View::resizeEvent(QResizeEvent*)
{
	update_layout();
}

void View::h_scroll_value_changed(int value)
{
	if (_updating_scroll)
		return;

	const int range = horizontalScrollBar()->maximum();
	if (range < MaxScrollValue)
		_offset = _scale * value;
	else {
		double length = 0, offset;
		get_scroll_layout(length, offset);
		_offset = _scale * length * value / MaxScrollValue;
	}

	_ruler->update();
	_cursorheader->update();
	_viewport->update();
}

void View::v_scroll_value_changed(int value)
{
	_v_offset = value;
	_header->update();
	_viewport->update();
}

void View::signals_changed()
{
	// Populate the traces
	clear_child_items();

	shared_lock<shared_mutex> lock(session().signals_mutex());
	const vector< shared_ptr<Signal> > &sigs(session().signals());
	for (auto s : sigs)
		add_child_item(s);

#ifdef ENABLE_DECODE
	const vector< shared_ptr<DecodeTrace> > decode_sigs(
		session().get_decode_signals());
	for (auto s : decode_sigs)
		add_child_item(s);
#endif

	// Create the initial layout
	int offset = SignalMargin + SignalHeight;
	for (shared_ptr<RowItem> r : *this) {
		r->set_v_offset(offset);
		offset += SignalHeight + 2 * SignalMargin;
	}

	update_layout();
	normalize_layout();
}

void View::data_updated()
{
	// Update the scroll bars
	update_scroll();

	// Repaint the view
	_viewport->update();
}

void View::marker_time_changed()
{
	_cursorheader->update();
	_viewport->update();
}

void View::on_signals_moved()
{
	update_scroll();
	signals_moved();
}

void View::on_geometry_updated()
{
	update_layout();
}

void View::on_hover_point_changed()
{
	for (shared_ptr<RowItem> r : *this)
		r->hover_point_changed();
}

} // namespace view
} // namespace pv
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifdef ENABLE_DECODE
	22	#include <libsigrokdecode/libsigrokdecode.h>
	23	#endif
	24
	25	#include <cassert>
	26	#include <climits>
	27	#include <cmath>
	28	#include <mutex>
	29
	30	#include <QEvent>
	31	#include <QMouseEvent>
	32	#include <QScrollBar>
	33
	34	#include "cursorheader.h"
	35	#include "decodetrace.h"
	36	#include "header.h"
	37	#include "ruler.h"
	38	#include "signal.h"
	39	#include "view.h"
	40	#include "viewport.h"
	41
	42	#include "pv/sigsession.h"
	43	#include "pv/data/logic.h"
	44	#include "pv/data/logicsnapshot.h"
	45
	46	using boost::shared_lock;
	47	using boost::shared_mutex;
	48	using pv::data::SignalData;
	49	using std::back_inserter;
	50	using std::deque;
	51	using std::list;
	52	using std::lock_guard;
	53	using std::max;
	54	using std::make_pair;
	55	using std::min;
	56	using std::pair;
	57	using std::set;
	58	using std::shared_ptr;
	59	using std::vector;
	60	using std::weak_ptr;
	61
	62	namespace pv {
	63	namespace view {
	64
	65	const double View::MaxScale = 1e9;
	66	const double View::MinScale = 1e-15;
	67
	68	const int View::MaxScrollValue = INT_MAX / 2;
	69
	70	const int View::SignalHeight = 30;
	71	const int View::SignalMargin = 10;
	72	const int View::SignalSnapGridSize = 10;
	73
	74	const QColor View::CursorAreaColour(220, 231, 243);
	75
	76	const QSizeF View::LabelPadding(4, 0);
	77
	78	View::View(SigSession &session, QWidget *parent) :
	79	QAbstractScrollArea(parent),
	80	_session(session),
	81	_viewport(new Viewport(*this)),
	82	_ruler(new Ruler(*this)),
	83	_cursorheader(new CursorHeader(*this)),
	84	_header(new Header(*this)),
	85	_scale(1e-6),
	86	_offset(0),
	87	_v_offset(0),
	88	_updating_scroll(false),
	89	_show_cursors(false),
	90	_cursors(*this),
	91	_hover_point(-1, -1)
	92	{
	93	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
	94	this, SLOT(h_scroll_value_changed(int)));
	95	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
	96	this, SLOT(v_scroll_value_changed(int)));
	97
	98	connect(&_session, SIGNAL(signals_changed()),
	99	this, SLOT(signals_changed()));
	100	connect(&_session, SIGNAL(capture_state_changed(int)),
	101	this, SLOT(data_updated()));
	102	connect(&_session, SIGNAL(data_received()),
	103	this, SLOT(data_updated()));
	104	connect(&_session, SIGNAL(frame_ended()),
	105	this, SLOT(data_updated()));
	106
	107	connect(_cursors.first().get(), SIGNAL(time_changed()),
	108	this, SLOT(marker_time_changed()));
	109	connect(_cursors.second().get(), SIGNAL(time_changed()),
	110	this, SLOT(marker_time_changed()));
	111
	112	connect(_header, SIGNAL(geometry_updated()),
	113	this, SLOT(on_geometry_updated()));
	114	connect(_header, SIGNAL(signals_moved()),
	115	this, SLOT(on_signals_moved()));
	116
	117	connect(_header, SIGNAL(selection_changed()),
	118	_cursorheader, SLOT(clear_selection()));
	119	connect(_cursorheader, SIGNAL(selection_changed()),
	120	_header, SLOT(clear_selection()));
	121
	122	connect(_header, SIGNAL(selection_changed()),
	123	this, SIGNAL(selection_changed()));
	124	connect(_cursorheader, SIGNAL(selection_changed()),
	125	this, SIGNAL(selection_changed()));
	126
	127	connect(this, SIGNAL(hover_point_changed()),
	128	this, SLOT(on_hover_point_changed()));
	129
	130	setViewport(_viewport);
	131
	132	_viewport->installEventFilter(this);
	133	_ruler->installEventFilter(this);
	134	_cursorheader->installEventFilter(this);
	135	_header->installEventFilter(this);
	136
	137	// Trigger the initial event manually. The default device has signals
	138	// which were created before this object came into being
	139	signals_changed();
	140
	141	// make sure the transparent widgets are on the top
	142	_cursorheader->raise();
	143	_header->raise();
	144	}
	145
	146	SigSession& View::session()
	147	{
	148	return _session;
	149	}
	150
	151	const SigSession& View::session() const
	152	{
	153	return _session;
	154	}
	155
	156	View* View::view()
	157	{
	158	return this;
	159	}
	160
	161	const View* View::view() const
	162	{
	163	return this;
	164	}
	165
	166	Viewport* View::viewport()
	167	{
	168	return _viewport;
	169	}
	170
	171	const Viewport* View::viewport() const
	172	{
	173	return _viewport;
	174	}
	175
	176	double View::scale() const
	177	{
	178	return _scale;
	179	}
	180
	181	double View::offset() const
	182	{
	183	return _offset;
	184	}
	185
	186	int View::owner_v_offset() const
	187	{
	188	return -_v_offset;
	189	}
	190
	191	void View::zoom(double steps)
	192	{
	193	zoom(steps, _viewport->width() / 2);
	194	}
	195
	196	void View::zoom(double steps, int offset)
	197	{
	198	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
	199	}
	200
	201	void View::zoom_fit()
	202	{
	203	const pair<double, double> extents = get_time_extents();
	204	const double delta = extents.second - extents.first;
	205	if (delta < 1e-12)
	206	return;
	207
	208	assert(_viewport);
	209	const int w = _viewport->width();
	210	if (w <= 0)
	211	return;
	212
	213	const double scale = max(min(delta / w, MaxScale), MinScale);
	214	set_scale_offset(scale, extents.first);
	215	}
	216
	217	void View::zoom_one_to_one()
	218	{
	219	using pv::data::SignalData;
	220
	221	// Make a set of all the visible data objects
	222	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	223	if (visible_data.empty())
	224	return;
	225
	226	double samplerate = 0.0;
	227	for (const shared_ptr<SignalData> d : visible_data) {
	228	assert(d);
	229	samplerate = max(samplerate, d->samplerate());
	230	}
	231
	232	if (samplerate == 0.0)
	233	return;
	234
	235	assert(_viewport);
	236	const int w = _viewport->width();
	237	if (w <= 0)
	238	return;
	239
	240	set_zoom(1.0 / samplerate, w / 2);
	241	}
	242
	243	void View::set_scale_offset(double scale, double offset)
	244	{
	245	_scale = scale;
	246	_offset = offset;
	247
	248	update_scroll();
	249	_ruler->update();
	250	_cursorheader->update();
	251	_viewport->update();
	252	scale_offset_changed();
	253	}
	254
	255	set< shared_ptr<SignalData> > View::get_visible_data() const
	256	{
	257	shared_lock<shared_mutex> lock(session().signals_mutex());
	258	const vector< shared_ptr<Signal> > &sigs(session().signals());
	259
	260	// Make a set of all the visible data objects
	261	set< shared_ptr<SignalData> > visible_data;
	262	for (const shared_ptr<Signal> sig : sigs)
	263	if (sig->enabled())
	264	visible_data.insert(sig->data());
	265
	266	return visible_data;
	267	}
	268
	269	pair<double, double> View::get_time_extents() const
	270	{
	271	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	272	if (visible_data.empty())
	273	return make_pair(0.0, 0.0);
	274
	275	double left_time = DBL_MAX, right_time = DBL_MIN;
	276	for (const shared_ptr<SignalData> d : visible_data)
	277	{
	278	const double start_time = d->get_start_time();
	279	double samplerate = d->samplerate();
	280	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	281
	282	left_time = min(left_time, start_time);
	283	right_time = max(right_time, start_time +
	284	d->get_max_sample_count() / samplerate);
	285	}
	286
	287	assert(left_time < right_time);
	288	return make_pair(left_time, right_time);
	289	}
	290
	291	bool View::cursors_shown() const
	292	{
	293	return _show_cursors;
	294	}
	295
	296	void View::show_cursors(bool show)
	297	{
	298	_show_cursors = show;
	299	_cursorheader->update();
	300	_viewport->update();
	301	}
	302
	303	void View::centre_cursors()
	304	{
	305	const double time_width = _scale * _viewport->width();
	306	_cursors.first()->set_time(_offset + time_width * 0.4);
	307	_cursors.second()->set_time(_offset + time_width * 0.6);
	308	_cursorheader->update();
	309	_viewport->update();
	310	}
	311
	312	CursorPair& View::cursors()
	313	{
	314	return _cursors;
	315	}
	316
	317	const CursorPair& View::cursors() const
	318	{
	319	return _cursors;
	320	}
	321
	322	const QPoint& View::hover_point() const
	323	{
	324	return _hover_point;
	325	}
	326
	327	void View::normalize_layout()
	328	{
	329	int v_min = INT_MAX;
	330	for (const shared_ptr<RowItem> r : *this)
	331	v_min = min(r->v_offset(), v_min);
	332
	333	const int delta = -min(v_min, 0);
	334	for (shared_ptr<RowItem> r : *this)
	335	r->set_v_offset(r->v_offset() + delta);
	336
	337	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	338	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
	339	}
	340
	341	void View::update_viewport()
	342	{
	343	assert(_viewport);
	344	_viewport->update();
	345	}
	346
	347	void View::get_scroll_layout(double &length, double &offset) const
	348	{
	349	const pair<double, double> extents = get_time_extents();
	350	length = (extents.second - extents.first) / _scale;
	351	offset = _offset / _scale;
	352	}
	353
	354	void View::set_zoom(double scale, int offset)
	355	{
	356	const double cursor_offset = _offset + _scale * offset;
	357	const double new_scale = max(min(scale, MaxScale), MinScale);
	358	const double new_offset = cursor_offset - new_scale * offset;
	359	set_scale_offset(new_scale, new_offset);
	360	}
	361
	362	void View::update_scroll()
	363	{
	364	assert(_viewport);
	365
	366	const QSize areaSize = _viewport->size();
	367
	368	// Set the horizontal scroll bar
	369	double length = 0, offset = 0;
	370	get_scroll_layout(length, offset);
	371	length = max(length - areaSize.width(), 0.0);
	372
	373	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	374
	375	_updating_scroll = true;
	376
	377	if (length < MaxScrollValue) {
	378	horizontalScrollBar()->setRange(0, length);
	379	horizontalScrollBar()->setSliderPosition(offset);
	380	} else {
	381	horizontalScrollBar()->setRange(0, MaxScrollValue);
	382	horizontalScrollBar()->setSliderPosition(
	383	_offset * MaxScrollValue / (_scale * length));
	384	}
	385
	386	_updating_scroll = false;
	387
	388	// Set the vertical scrollbar
	389	verticalScrollBar()->setPageStep(areaSize.height());
	390	verticalScrollBar()->setRange(0,
	391	_viewport->get_total_height() + SignalMargin -
	392	areaSize.height());
	393	}
	394
	395	void View::update_layout()
	396	{
	397	setViewportMargins(
	398	_header->sizeHint().width() - pv::view::Header::BaselineOffset,
	399	_ruler->sizeHint().height(), 0, 0);
	400	_ruler->setGeometry(_viewport->x(), 0,
	401	_viewport->width(), _viewport->y());
	402	_cursorheader->setGeometry(
	403	_viewport->x(),
	404	_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
	405	_viewport->width(), _cursorheader->sizeHint().height());
	406	_header->setGeometry(0, _viewport->y(),
	407	_header->sizeHint().width(), _viewport->height());
	408	update_scroll();
	409	}
	410
	411	void View::paint_label(QPainter &p, int right, bool hover)
	412	{
	413	(void)p;
	414	(void)right;
	415	(void)hover;
	416	}
	417
	418	QRectF View::label_rect(int right)
	419	{
	420	(void)right;
	421	return QRectF();
	422	}
	423
	424	bool View::eventFilter(QObject object, QEvent event)
	425	{
	426	const QEvent::Type type = event->type();
	427	if (type == QEvent::MouseMove) {
	428
	429	const QMouseEvent const mouse_event = (QMouseEvent)event;
	430	if (object == _viewport)
	431	_hover_point = mouse_event->pos();
	432	else if (object == _ruler \|\| object == _cursorheader)
	433	_hover_point = QPoint(mouse_event->x(), 0);
	434	else if (object == _header)
	435	_hover_point = QPoint(0, mouse_event->y());
	436	else
	437	_hover_point = QPoint(-1, -1);
	438
	439	hover_point_changed();
	440
	441	} else if (type == QEvent::Leave) {
	442	_hover_point = QPoint(-1, -1);
	443	hover_point_changed();
	444	}
	445
	446	return QObject::eventFilter(object, event);
	447	}
	448
	449	bool View::viewportEvent(QEvent *e)
	450	{
	451	switch(e->type()) {
	452	case QEvent::Paint:
	453	case QEvent::MouseButtonPress:
	454	case QEvent::MouseButtonRelease:
	455	case QEvent::MouseButtonDblClick:
	456	case QEvent::MouseMove:
	457	case QEvent::Wheel:
	458	case QEvent::TouchBegin:
	459	case QEvent::TouchUpdate:
	460	case QEvent::TouchEnd:
	461	return false;
	462
	463	default:
	464	return QAbstractScrollArea::viewportEvent(e);
	465	}
	466	}
	467
	468	void View::resizeEvent(QResizeEvent*)
	469	{
	470	update_layout();
	471	}
	472
	473	void View::h_scroll_value_changed(int value)
	474	{
	475	if (_updating_scroll)
	476	return;
	477
	478	const int range = horizontalScrollBar()->maximum();
	479	if (range < MaxScrollValue)
	480	_offset = _scale * value;
	481	else {
	482	double length = 0, offset;
	483	get_scroll_layout(length, offset);
	484	_offset = _scale * length * value / MaxScrollValue;
	485	}
	486
	487	_ruler->update();
	488	_cursorheader->update();
	489	_viewport->update();
	490	}
	491
	492	void View::v_scroll_value_changed(int value)
	493	{
	494	_v_offset = value;
	495	_header->update();
	496	_viewport->update();
	497	}
	498
	499	void View::signals_changed()
	500	{
	501	// Populate the traces
	502	clear_child_items();
	503
	504	shared_lock<shared_mutex> lock(session().signals_mutex());
	505	const vector< shared_ptr<Signal> > &sigs(session().signals());
	506	for (auto s : sigs)
	507	add_child_item(s);
	508
	509	#ifdef ENABLE_DECODE
	510	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	511	session().get_decode_signals());
	512	for (auto s : decode_sigs)
	513	add_child_item(s);
	514	#endif
	515
	516	// Create the initial layout
	517	int offset = SignalMargin + SignalHeight;
	518	for (shared_ptr<RowItem> r : *this) {
	519	r->set_v_offset(offset);
	520	offset += SignalHeight + 2 * SignalMargin;
	521	}
	522
	523	update_layout();
	524	normalize_layout();
	525	}
	526
	527	void View::data_updated()
	528	{
	529	// Update the scroll bars
	530	update_scroll();
	531
	532	// Repaint the view
	533	_viewport->update();
	534	}
	535
	536	void View::marker_time_changed()
	537	{
	538	_cursorheader->update();
	539	_viewport->update();
	540	}
	541
	542	void View::on_signals_moved()
	543	{
	544	update_scroll();
	545	signals_moved();
	546	}
	547
	548	void View::on_geometry_updated()
	549	{
	550	update_layout();
	551	}
	552
	553	void View::on_hover_point_changed()
	554	{
	555	for (shared_ptr<RowItem> r : *this)
	556	r->hover_point_changed();
	557	}
	558
	559	} // namespace view
	560	} // namespace pv